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          <h1 class="post-title" itemprop="name headline">iOS-FMDB(数据库框架)</h1>
        

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        <p>####<a href="http://ccgus.github.io/fmdb/" target="_blank" rel="noopener">FMDB</a></p>
<p>####1. 导包<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">// 点击项目-&gt;General-&gt;Linked Frameworks and Libraries-&gt;搜索libsqlite3.tbd,并add.</span><br><span class="line">#import &quot;FMDB.h&quot;</span><br><span class="line">#import &lt;sqlite3.h&gt;</span><br><span class="line">@interface ViewController ()</span><br><span class="line">// 数据库对象</span><br><span class="line">@property (nonatomic, strong) FMDatabase *fmDatabase;</span><br><span class="line">@end</span><br></pre></td></tr></table></figure></p>
<a id="more"></a>
<p>####2. 打开数据库<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">// 创建数据库路径</span><br><span class="line">NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@&quot;data.sqlite&quot;];</span><br><span class="line">// 创建数据库对象</span><br><span class="line">FMDatabase *db = [FMDatabase databaseWithPath:path];</span><br><span class="line">self.fmDatabase = db;</span><br><span class="line">// 打开数据库，true，打开成功；false，打开失败</span><br><span class="line">BOOL isSuccess = [db open];</span><br><span class="line">// 判断是否打开成功</span><br><span class="line">if (isSuccess) &#123;</span><br><span class="line">    NSLog(@&quot;打开数据库成功&quot;);</span><br><span class="line">    NSLog(@&quot;数据库路径：%@&quot;, path);</span><br><span class="line">&#125; else &#123;</span><br><span class="line">    NSLog(@&quot;打开数据库失败&quot;);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>####3. 创建表<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">// 创建表,执行sql语句，增删改相同，查询不一样</span><br><span class="line">NSString *sql = @&quot;create table if not exists test(id integer primary key autoincrement, name text, age integer);&quot;;</span><br><span class="line">// 执行创建表命令，true, 创建成功；false，创建失败</span><br><span class="line">BOOL isSuccess = [self.fmDatabase executeUpdate:sql];</span><br><span class="line">if (isSuccess) &#123;</span><br><span class="line">    NSLog(@&quot;创建表成功&quot;);</span><br><span class="line">&#125; else &#123;</span><br><span class="line">    NSLog(@&quot;创建表失败&quot;);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>####4. 插入数据<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">// 向表中添加100条数据</span><br><span class="line">for (int i = 0; i &lt; 100; i++) &#123;</span><br><span class="line">    // 名称设置</span><br><span class="line">    NSString *name = [NSString stringWithFormat:@&quot;item-%d&quot;, i];</span><br><span class="line">    // 随机生成20--25岁之间的年龄</span><br><span class="line">    NSInteger age = arc4random_uniform(5) + 20;</span><br><span class="line">    // sql语句拼接</span><br><span class="line">    NSString *sql = [NSString stringWithFormat:@&quot;insert into test(name,age) values(&apos;%@&apos;,%zd);&quot;, name, age];</span><br><span class="line">    // 执行插入语句</span><br><span class="line">    BOOL isSuccess = [self.fmDatabase executeUpdate:sql];</span><br><span class="line">    // 判断是否添加成功</span><br><span class="line">    if (isSuccess) &#123;</span><br><span class="line">        NSLog(@&quot;添加成功&quot;);</span><br><span class="line">    &#125; else &#123;</span><br><span class="line">        NSLog(@&quot;添加失败&quot;);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>####5. 查询数据<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line">// 查询语句</span><br><span class="line">NSString *sql = @&quot;select name,age from test where age = 23;&quot;;</span><br><span class="line">// 执行查询语句</span><br><span class="line">FMResultSet *result = [self.fmDatabase executeQuery:sql];</span><br><span class="line">// 遍历查询结果</span><br><span class="line">while ([result next]) &#123;</span><br><span class="line">    // name</span><br><span class="line">    NSString *name = [result stringForColumnIndex:0];</span><br><span class="line">    // age</span><br><span class="line">    NSInteger age = [result intForColumnIndex:1];</span><br><span class="line">    NSLog(@&quot;name = %@, age = %ld.&quot;, name, age);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>####6. 更新数据<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">// 修改语句</span><br><span class="line">NSString *sql = @&quot;update test set age = 30 where age &lt; 22;&quot;;</span><br><span class="line">// 执行sql语句</span><br><span class="line">BOOL isSuccess = [self.fmDatabase executeUpdate:sql];</span><br><span class="line">if (isSuccess) &#123;</span><br><span class="line">    NSLog(@&quot;修改数据成功&quot;);</span><br><span class="line">&#125; else &#123;</span><br><span class="line">    NSLog(@&quot;修改数据失败&quot;);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>####7. 删除数据<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">// 删除语句</span><br><span class="line">NSString *sql = @&quot;delete from test where age &gt; 25;&quot;;</span><br><span class="line">// 执行语句</span><br><span class="line">BOOL isSuccess = [self.fmDatabase executeUpdate:sql];</span><br><span class="line">if (isSuccess) &#123;</span><br><span class="line">    NSLog(@&quot;删除成功&quot;);</span><br><span class="line">&#125; else &#123;</span><br><span class="line">    NSLog(@&quot;删除失败&quot;);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>

      
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